An accurate technique of measurement of flow rate using rotameter as a primary sensor and an improved op-amp based network

摘要

AbstractIn the present paper, a simple rotameter transmitter has been studied using an inductive coil in differential form as a secondary sensor and rotameter as the primary sensor. The proposed technique measures the flow rate and converts the flow rate variation into an electrical current which can be easily transmitted to a remote location likeacontrol room. The change in inductance due to change in flow rate is measured by an improved op-amp inductance based network. The proposed prototype transmitter unit has been designed and developed and then its theory of operation has been derived. The performance of the developed transducer has been experimentally studied and the experimental results are reported in the paper. The experimental result appears to follow the theoretical equations with very good linearity and repeatability with very small uncertainty in measurement. The graphical abstract is shown below.Graphical abstractDisplay OmittedHighlights?A new simple technique on flow measurement has been designed, developed and fabricated using local indicating type flowmeter.?Rotameter which is used as a local indicator is modified using differential inductive coils fabricated at the top of the rotameter.?The movement of the float is transmitted to the differential coil. Thus changes the inductances of two coils.?The change in inductance is converted into a voltage signal with the help of an improved and modified op-amp based network and then this signal is transmitted into 4–20mA current signal in order to send it to a remote location like control room etc.?The proposed designed and fabricated unit shows a very good accuracy, linearity and repeatability.]]>